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How To Cut Common Rafters ---continued Pt.2
Example:
The Step Off Method
- Total Building Width (SPAN) = 30'-0"
- Total Building Run (HALF SPAN) = 15'-0"
- Pitch Of Roof---6/12 or 6" of rise for every 1' of run--(to center of building).
2' Square Settings:
Lock a square guide on the tongue of the square at 6"---(pitch or rise of roof).
Lock a square guide on the body of the square at 12"---(run of roof).
Step 1. FASCIA BOARD CUT -1a
This is the first cut.
As you can see by the drawing below, this is the first part of the rafter that gets removed. Notice the position of the framing square where the 6" and the 12" numbers are placed. This is a 6/12 fasica board cut.
As you can see by the drawing below, this is the first part of the rafter that gets removed. Notice the position of the framing square where the 6" and the 12" numbers are placed. This is a 6/12 fasica board cut.
Step 2. FASCIA BOARD CUT -1b
This is the second cut.
As you can see by the drawing below, the framing square is moved to a new position to layout the cut for the seat cut.This is the second part of the rafter that gets removed.
This area is for setting up the rafter to receive a 2x6 Sub-Fascia Board.
Step 3. BIRD'S MOUTH LAYOUT-1a
Draw Plumb Line.
As you can see by the drawing below, the square is moved up the rafter 10-1/2" to create a 12" overhang on the building that includes the 2x6 sub-fascia board.
As you can see by the drawing below, the square is moved up the rafter 10-1/2" to create a 12" overhang on the building that includes the 2x6 sub-fascia board.
Now draw a plumb line along the tongue of the square that represents the 6" pitch. This represents the outside of the building wall.
Step 4. BIRD'S MOUTH LAYOUT-1b
Draw The Level Line -- or Seat Cut
As you can see by the drawing below, the seat cut or level line is drawn. If your outside walls are 2x4 then this dimension is generally is 4" long. This is where the rafter will sit on the building wall plate. If the wall is a 2x6 then this line will have to be adjusted to accommodate the different sized wall.
Step 5. BIRD'S MOUTH -FINISH
Cut Out The Bird's Mouth.
The picture below shows the entire area of the Bird's Mouth removed.
COMPLETED RAFTER TAIL
The picture below shows a completed 2x8 rafter tail with the birds mouth cut out to sit on a 2x4 wall. It also shows an attached 2x6 Sub-Fascia board.
continue---->How To Cut Common Rafters--part 3